(note: Illusions from doppelwalk and spirit lance are slightly different)

It seems to me that PL illusions do less damage (despite his 4.2 agi growth, but someone else will have to do the math), but there are more of them and they probably attack faster, making diffusal blade stronger on PL than on Naga. But with the extra damage the illusions from naga have, I guess butterfly is better on Naga than it is on PL?

PL will have more armor at lvl25 I assume, and with the extra magic resistance from his ult I'm not so sure Naga illusions are tankier.

Their differences are interesting, I think I'll create a new thread about this when I get home from work.

I didn't mean PL illusions did more damage each, they deal more damage in general as they're 5 more illusions. Each does 20%, but still, that's a total of 160% damage compared to Naga's 135%, add in PL's AGI growth and it's a lot more, and PL can do them on demand while Naga needs to wait the CD (not to mention they don't have 100% uptime)

Butterfly is simply not better on Naga. Any DPS item is better with PL because he gets more out of them considering that all illusions are out, and the evasion is a lot better on PL because there are more illusions to chew trough.

However naga illusions get A LOT more from tank items, such as Heart, or even early game such as Drum, due to the higher STR growth and taking 200% damage as opposed to PL's 350%, which is a huge difference. Also a bonus is that you can create naga illusions against towers, unlike PL, but PL can create them on demand with creeps, where Naga can't if her illusions got destroyed or the duration is off but the Cd isn't (Even if it's a miserable 10 seconds difference, if they get destroyed by, for example, an OD straight away, that's a huge CD you've got to wait out)

In total, PL gets more damage, but way, way less tank. While he has bonus magic resistance, naga has less illusion 'damage taken' and higher STR growth. This is why Naga is better at pushing towers (since you can jsut MIrror image + manta and send them to shred the tower appart as opposed to PL since he needs creeps) but worse at constant split push (rat dota)